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While passive diffusion was initially proposed as the main absorption route, recent evidence indicates that specific transmembrane transporters including Na-taurocholate cotransporting polypeptide, organic anion-transporting polypeptides, L-type amino acid transporters, and monocarboxylate transporters also facilitate LT4 uptake

Svensson agreed

Many people who receive vitamin B through IV therapy see notable improvements in concentration and cognition

10.1016/j.arr.2022.101790 272 SobralF.SampaioA.FalcoS.QueirozM

Results: Mountain dwellers were characterized by higher HDL (p = 0.022)